The version of curator that we currently use (5.2.0) isn't compatible with elasticsearch 6. Which causes issues in a few cron on logtash servers (see blelow). Version 5.6.0 supports both elasticsearch 5 and 6.
Traceback (most recent call last):
File "/usr/bin/curator", line 11, in <module>
load_entry_point('elasticsearch-curator==5.2.0', 'console_scripts', 'curator')()
File "/usr/lib/python2.7/dist-packages/click/core.py", line 716, in __call__
return self.main(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/click/core.py", line 696, in main
rv = self.invoke(ctx)
File "/usr/lib/python2.7/dist-packages/click/core.py", line 889, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/lib/python2.7/dist-packages/click/core.py", line 534, in invoke
return callback(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/curator/cli.py", line 211, in cli
run(config, action_file, dry_run)
File "/usr/lib/python2.7/dist-packages/curator/cli.py", line 158, in run
client = get_client(**client_args)
File "/usr/lib/python2.7/dist-packages/curator/utils.py", line 800, in get_client
'Error: {0}'.format(e)
elasticsearch.exceptions.ElasticsearchException: Unable to create client connection to Elasticsearch. Error: Elasticsearch version 6.5.4 incompatible with this version of Curator (5.2.0)